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</tbody>
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<p>&#x5BF9;&#x4E8E;&#x5B57;&#x7B26;&#x4E32;&#x800C;&#x8A00;&#xFF0C;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x901A;&#x5E38;&#x6709;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#xFF1A;search() &#x548C; replace(),&#x663E;&#x7136;&#x524D;&#x8005;&#x662F;&#x68C0;&#x7D22;&#x540E;&#x8005;&#x662F;&#x66FF;&#x6362;&#x3002;</p>
<p>&#x73B0;&#x5728;&#x6211;&#x4EEC;&#x6765;&#x5C1D;&#x8BD5;&#x4E00;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> str = <span class="hljs-string">&quot;Hello World&quot;</span>;
<span class="hljs-comment">//  i &#x641C;&#x7D22;&#x4E0D;&#x533A;&#x5206;&#x5927;&#x5C0F;&#x5199; &#x8FD4;&#x56DE;&#x7B2C;&#x4E00;&#x6B21;&#x51FA;&#x73B0;&#x7684;&#x4F4D;&#x7F6E;</span>
<span class="hljs-comment">// &#x4F8B;&#x5982;&#xFF1A;&#x4E0B;&#x9762;&#x68C0;&#x7D22; &#x7B2C;&#x4E00;&#x6B21;&#x51FA;&#x73B0;world&#x7684;&#x5730;&#x65B9;</span>
<span class="hljs-keyword">var</span> i = str.search(<span class="hljs-regexp">/WORLD/i</span>);
<span class="hljs-comment">// g &#x662F;&#x533A;&#x5206;&#x5927;&#x5C0F;&#x5199;&#x7684;,&#x5E76;&#x4E14;&#x662F;&#x5168;&#x5C40;&#x641C;&#x7D22;</span>
<span class="hljs-keyword">var</span> g = str.search(<span class="hljs-regexp">/L/g</span>);

<span class="hljs-comment">// &#x5BF9;&#x4E8E; m &#x6D4B;&#x8BD5;&#x53D1;&#x73B0;,&#x7528;&#x5904;&#x771F;&#x7684;&#x4E0D;&#x662F;&#x5F88;&#x5927;,g &#x5C31;&#x53EF;&#x4EE5;&#x4E86;</span>
<span class="hljs-keyword">var</span> str2 = <span class="hljs-string">&quot;1\n 2\n 3\n&quot;</span>;
<span class="hljs-keyword">var</span> g2 = str2.search(<span class="hljs-regexp">/2/g</span>);
<span class="hljs-keyword">var</span> m2 = str2.search(<span class="hljs-regexp">/2/m</span>);

<span class="hljs-comment">// &#x66FF;&#x6362;&#x5B57;&#x7B26;&#x4E32;</span>
<span class="hljs-keyword">var</span> str3 = <span class="hljs-string">&quot;AABB&quot;</span>;

<span class="hljs-comment">// &#x4EC5;&#x5C06;&#x7B2C;&#x4E00;&#x6B21;&#x51FA;&#x73B0;&#x7684; A&#x7684;&#x66FF;&#x6362;&#x6210; 1</span>
<span class="hljs-keyword">var</span> i3 = str3.replace(<span class="hljs-regexp">/a/i</span>,<span class="hljs-string">&quot;1&quot;</span>);
<span class="hljs-comment">// &#x65E2;&#x5168;&#x5C40;&#x5339;&#x914D;&#x53C8;&#x5FFD;&#x7565;&#x5927;&#x5C0F;&#x5199;,&#x5C06;&#x6240;&#x6709;&#x7684;A&#x5747;&#x66FF;&#x6362;&#x4E3A;1,&#x4FEE;&#x9970;&#x7B26;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x62FC;&#x63A5;,&#x662F;&amp;&#x7684;&#x5173;&#x7CFB;</span>
<span class="hljs-keyword">var</span> gi3 = str3.replace(<span class="hljs-regexp">/a/gi</span>,<span class="hljs-string">&quot;1&quot;</span>);
</code></pre>
<pre><code class="lang-she"> i =&gt; 6
 g =&gt; -1  &#x4E0A;&#x9762;&#x6CA1;&#x6709;&#x5927;&#x5199;&#x7684;L &#x6240;&#x4EE5;&#x8FD4;&#x56DE; -1
 g2 =&gt; 3
 m2 =&gt; 3
 str3 =&gt; AABB &#x66FF;&#x6362;&#x540E;&#xFF0C;&#x539F;&#x6765;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x662F;&#x4E0D;&#x53D8;&#x7684;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;string&#x624D;&#x53D8;&#x4E86;
 i3 =&gt; 1ABB
 gi3 =&gt; 11BB
</code></pre>
<p>&#x4EE5;&#x4E0A;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x5BF9;&#x4E8E;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;JavaScript &#x91CC;&#x6709;&#x4E00;&#x4E2A;&#x9884;&#x5B9A;&#x4E49;&#x4E86;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x7684;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x5BF9;&#x8C61; RegExp &#x3002;</p>
<p>&#x8BE5;&#x5BF9;&#x8C61;&#x6709;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#xFF1A;test() &#x548C; exec().</p>
<p>&#x73B0;&#x5728;&#x5C1D;&#x8BD5;&#x4E00;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> rep = <span class="hljs-regexp">/a/i</span>;
<span class="hljs-comment">// &#x53E6;&#x79CD;&#x5199;&#x6CD5;,new &#x4E00;&#x4E2A;RegExp &#x5BF9;&#x8C61;,&#x4E5F;&#x53EF;&#x4EE5;&#x7701;&#x7565;,&#x7528;&#x4E0A;&#x9762;&#x7684;&#x5199;&#x6CD5;&#x4E5F;&#x884C;</span>
<span class="hljs-comment">// var rep = new RegExp(/a/i);</span>
<span class="hljs-comment">// &#x8BE5;&#x65B9;&#x6CD5;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;boolean &#x7C7B;&#x578B;,&#x5982;&#x679C;&#x6709;&#x7B26;&#x5408;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8FD4;&#x56DE;true,&#x53CD;&#x4E4B;&#x8FD4;&#x56DE;false</span>
<span class="hljs-keyword">var</span> test = rep.test(<span class="hljs-string">&quot;abcd&quot;</span>);
<span class="hljs-comment">// &#x8BE5;&#x65B9;&#x6CD5;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;</span>
<span class="hljs-keyword">var</span> exec = rep.exec(<span class="hljs-string">&quot;abcd&quot;</span>);
</code></pre>
<pre><code class="lang-shell">test =&gt; true
exec =&gt; [ &apos;a&apos;, index: 0, input: &apos;abcd&apos; ]
</code></pre>

                                
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